Engagement Ring lost Diamond for the 6th time!!!

I got my engagement ring from you in 2009 and in the past 6 years I have had to have a diamond replaced 5 times already, the last time was less than a year ago and now surprise surprise its gone again!!! the ring I have is no longer sold by you guys so a replacement ring is not possible and I am getting tired of having to come in every year to have it fixed, when I do come into your store your employees are very unhelpful and I have to revert to hello Peter every time to get any action, hence why I am writing this prior to coming into your store.<br> what can be done about this???? will you replace the diamond again or replace the ring with one of the same value?? i am so sick of this and need a permanent solution!!!